Mbói Tu'ĩ is one of the seven legendary monsters of Guaraní mythology. He was the second son of Tau and Kerana.
Mbói Tu'ĩ literally translates to "snake-parrot" which describes this creature's appearance.
Mbói Tu'ĩ has the form of an enormous serpent with a huge parrot head and a huge beak. It also has a red, forked tongue the colour of blood. Its skin is scaly and streaked. Feathers cover its head. It has a harmful look that frightens anyone who has the misfortune of meeting it. It surveys swamps protecting amphibian life. Furthermore, it enjoys humid places and flowers. It lets out an incredibly powerful and terrible squawk which can be heard from very far off and which instils terror in all who hear it. It is considered the protector of aquatic animals and wetlands.
The Folklore, Mystery and Beauty C.W. Peters - the legend of how Iguassu was formed by the Serpentine God of the river - Mbói